This pack has all of the same great features of the standard 3 Day Assault with the addition of our removable Bolstered Ventilation and Stability (BVS) system (patent pending). This system was designed to give more stability to a pack when worn with body armor. The removable Bolsters are made of injection molded EVA that is incredibly durable, and the removability allows the pack to be optimized for operations where body armor isn’t necessary.